yield return - sklab @ ウィキ

• メモリの節約やLINQで大活躍

foreach(var s in GetArray()){
   Console.WriteLine(s);
}

public string[] GetArray(){
  return new String[]{"a","b","c"};
}

public string[] GetArray(){
  yield return "a";
  yield return "b";
  yield return "c";

}